Circuit Diagram - DeDietrich ZENA MS 24 MI FF Operating And Installation Instructions

Figure 17
Key:
1 Pump and air separator
2 No-return valve
3 Three-way valve
4 Three-way valve motor
5 Pressure gauge
6 Heating circuit extractable lter
7 Disconnector
8 Boiler lling tap
9 Cold water extractable lter
10 DHW priority sensor
11 NTC domestic hot water sensor
12 Check valve on automatic by-pass
13 Water pressure switch
14 Boiler drain tap
15 Safety valve
INSTALLATION INSTRUCTIONS
33. FUNCTIONAL CIRCUIT DIAGRAM
Heating ow DHW
outlet
24 MI FF
Gas DHW Heating return
inlet
16 Water-water plate heat exchanger
17 Gas valve with gas diaphragm
18 Gas train with nozzles
19 Central heating NTC sensor
20 Ignition/ ame detection electrode
21 Safety thermostat
22 Water-fumes exchanger
23 Fumes conveyor
24 Fan
25 Venturi tube
26 Positive pressure point
27 Negative pressure point
28 Air pressure switch
29 Burner
30 Expansion vessel
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71.06952.02 - EN